1 /*
2 * Copyright (c) 2008, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/javaClasses.inline.hpp"
27 #include "classfile/stringTable.hpp"
28 #include "code/codeCache.hpp"
29 #include "code/codeCacheExtensions.hpp"
30 #include "code/dependencyContext.hpp"
31 #include "compiler/compileBroker.hpp"
32 #include "interpreter/interpreter.hpp"
33 #include "interpreter/oopMapCache.hpp"
34 #include "interpreter/linkResolver.hpp"
35 #include "memory/allocation.inline.hpp"
36 #include "memory/oopFactory.hpp"
37 #include "oops/objArrayOop.inline.hpp"
38 #include "oops/oop.inline.hpp"
39 #include "prims/methodHandles.hpp"
40 #include "prims/jvmtiRedefineClassesTrace.hpp"
41 #include "runtime/compilationPolicy.hpp"
42 #include "runtime/javaCalls.hpp"
43 #include "runtime/reflection.hpp"
44 #include "runtime/signature.hpp"
45 #include "runtime/stubRoutines.hpp"
46 #include "utilities/exceptions.hpp"
47
48
49 /*
50 * JSR 292 reference implementation: method handles
51 * The JDK 7 reference implementation represented method handle
52 * combinations as chains. Each link in the chain had a "vmentry"
53 * field which pointed at a bit of assembly code which performed
54 * one transformation before dispatching to the next link in the chain.
55 *
56 * The current reference implementation pushes almost all code generation
57 * responsibility to (trusted) Java code. A method handle contains a
58 * pointer to its "LambdaForm", which embodies all details of the method
59 * handle's behavior. The LambdaForm is a normal Java object, managed
60 * by a runtime coded in Java.
61 */
62
63 bool MethodHandles::_enabled = false; // set true after successful native linkage
64 MethodHandlesAdapterBlob* MethodHandles::_adapter_code = NULL;
65
66
67 /**
68 * Generates method handle adapters. Returns 'false' if memory allocation
69 * failed and true otherwise.
70 */
71 bool MethodHandles::generate_adapters() {
72 if (SystemDictionary::MethodHandle_klass() == NULL) {
73 return true;
74 }
75
76 assert(_adapter_code == NULL, "generate only once");
77
78 ResourceMark rm;
79 TraceTime timer("MethodHandles adapters generation", TraceStartupTime);
80 _adapter_code = MethodHandlesAdapterBlob::create(adapter_code_size);
81 if (_adapter_code == NULL) {
82 return false;
83 }
84
85 CodeBuffer code(_adapter_code);
86 MethodHandlesAdapterGenerator g(&code);
87 g.generate();
88 code.log_section_sizes("MethodHandlesAdapterBlob");
89 return true;
90 }
91
92 //------------------------------------------------------------------------------
93 // MethodHandlesAdapterGenerator::generate
94 //
95 void MethodHandlesAdapterGenerator::generate() {
96 // Generate generic method handle adapters.
97 // Generate interpreter entries
98 for (Interpreter::MethodKind mk = Interpreter::method_handle_invoke_FIRST;
99 mk <= Interpreter::method_handle_invoke_LAST;
100 mk = Interpreter::MethodKind(1 + (int)mk)) {
101 vmIntrinsics::ID iid = Interpreter::method_handle_intrinsic(mk);
102 StubCodeMark mark(this, "MethodHandle::interpreter_entry", vmIntrinsics::name_at(iid));
103 address entry = MethodHandles::generate_method_handle_interpreter_entry(_masm, iid);
104 if (entry != NULL) {
105 CodeCacheExtensions::handle_generated_pc(entry, vmIntrinsics::name_at(iid));
106 Interpreter::set_entry_for_kind(mk, entry);
107 }
108 // If the entry is not set, it will throw AbstractMethodError.
109 }
110 }
111
112 void MethodHandles::set_enabled(bool z) {
113 if (_enabled != z) {
114 guarantee(z, "can only enable once");
115 _enabled = z;
116 }
117 }
118
119 // MemberName support
120
121 // import java_lang_invoke_MemberName.*
122 enum {
123 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD,
124 IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR,
125 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD,
126 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE,
127 CALLER_SENSITIVE = java_lang_invoke_MemberName::MN_CALLER_SENSITIVE,
128 REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT,
129 REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK,
130 SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES,
131 SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES,
132 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE
133 };
134
135 Handle MethodHandles::new_MemberName(TRAPS) {
136 Handle empty;
137 instanceKlassHandle k(THREAD, SystemDictionary::MemberName_klass());
138 if (!k->is_initialized()) k->initialize(CHECK_(empty));
139 return Handle(THREAD, k->allocate_instance(THREAD));
140 }
141
142 oop MethodHandles::init_MemberName(Handle mname, Handle target) {
143 // This method is used from java.lang.invoke.MemberName constructors.
144 // It fills in the new MemberName from a java.lang.reflect.Member.
145 Thread* thread = Thread::current();
146 oop target_oop = target();
147 Klass* target_klass = target_oop->klass();
148 if (target_klass == SystemDictionary::reflect_Field_klass()) {
149 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder()
150 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index()
151 KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
152 if (!k.is_null() && k->is_instance_klass()) {
153 fieldDescriptor fd(InstanceKlass::cast(k()), slot);
154 oop mname2 = init_field_MemberName(mname, fd);
155 if (mname2 != NULL) {
156 // Since we have the reified name and type handy, add them to the result.
157 if (java_lang_invoke_MemberName::name(mname2) == NULL)
158 java_lang_invoke_MemberName::set_name(mname2, java_lang_reflect_Field::name(target_oop));
159 if (java_lang_invoke_MemberName::type(mname2) == NULL)
160 java_lang_invoke_MemberName::set_type(mname2, java_lang_reflect_Field::type(target_oop));
161 }
162 return mname2;
163 }
164 } else if (target_klass == SystemDictionary::reflect_Method_klass()) {
165 oop clazz = java_lang_reflect_Method::clazz(target_oop);
166 int slot = java_lang_reflect_Method::slot(target_oop);
167 KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
168 if (!k.is_null() && k->is_instance_klass()) {
169 Method* m = InstanceKlass::cast(k())->method_with_idnum(slot);
170 if (m == NULL || is_signature_polymorphic(m->intrinsic_id()))
171 return NULL; // do not resolve unless there is a concrete signature
172 CallInfo info(m, k());
173 return init_method_MemberName(mname, info);
174 }
175 } else if (target_klass == SystemDictionary::reflect_Constructor_klass()) {
176 oop clazz = java_lang_reflect_Constructor::clazz(target_oop);
177 int slot = java_lang_reflect_Constructor::slot(target_oop);
178 KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
179 if (!k.is_null() && k->is_instance_klass()) {
180 Method* m = InstanceKlass::cast(k())->method_with_idnum(slot);
181 if (m == NULL) return NULL;
182 CallInfo info(m, k());
183 return init_method_MemberName(mname, info);
184 }
185 }
186 return NULL;
187 }
188
189 oop MethodHandles::init_method_MemberName(Handle mname, CallInfo& info) {
190 assert(info.resolved_appendix().is_null(), "only normal methods here");
191 methodHandle m = info.resolved_method();
192 assert(m.not_null(), "null method handle");
193 KlassHandle m_klass = m->method_holder();
194 assert(m.not_null(), "null holder for method handle");
195 int flags = (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS );
196 int vmindex = Method::invalid_vtable_index;
197
198 switch (info.call_kind()) {
199 case CallInfo::itable_call:
200 vmindex = info.itable_index();
201 // More importantly, the itable index only works with the method holder.
202 assert(m_klass->verify_itable_index(vmindex), "");
203 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT);
204 if (TraceInvokeDynamic) {
205 ResourceMark rm;
206 tty->print_cr("memberName: invokeinterface method_holder::method: %s, itableindex: %d, access_flags:",
207 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
208 vmindex);
209 m->access_flags().print_on(tty);
210 if (!m->is_abstract()) {
211 tty->print("default");
212 }
213 tty->cr();
214 }
215 break;
216
217 case CallInfo::vtable_call:
218 vmindex = info.vtable_index();
219 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT);
220 assert(info.resolved_klass()->is_subtype_of(m_klass()), "virtual call must be type-safe");
221 if (m_klass->is_interface()) {
222 // This is a vtable call to an interface method (abstract "miranda method" or default method).
223 // The vtable index is meaningless without a class (not interface) receiver type, so get one.
224 // (LinkResolver should help us figure this out.)
225 KlassHandle m_klass_non_interface = info.resolved_klass();
226 if (m_klass_non_interface->is_interface()) {
227 m_klass_non_interface = SystemDictionary::Object_klass();
228 #ifdef ASSERT
229 { ResourceMark rm;
230 Method* m2 = m_klass_non_interface->vtable()->method_at(vmindex);
231 assert(m->name() == m2->name() && m->signature() == m2->signature(),
232 "at %d, %s != %s", vmindex,
233 m->name_and_sig_as_C_string(), m2->name_and_sig_as_C_string());
234 }
235 #endif //ASSERT
236 }
237 if (!m->is_public()) {
238 assert(m->is_public(), "virtual call must be to public interface method");
239 return NULL; // elicit an error later in product build
240 }
241 assert(info.resolved_klass()->is_subtype_of(m_klass_non_interface()), "virtual call must be type-safe");
242 m_klass = m_klass_non_interface;
243 }
244 if (TraceInvokeDynamic) {
245 ResourceMark rm;
246 tty->print_cr("memberName: invokevirtual method_holder::method: %s, receiver: %s, vtableindex: %d, access_flags:",
247 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
248 m_klass->internal_name(), vmindex);
249 m->access_flags().print_on(tty);
250 if (m->is_default_method()) {
251 tty->print("default");
252 }
253 tty->cr();
254 }
255 break;
256
257 case CallInfo::direct_call:
258 vmindex = Method::nonvirtual_vtable_index;
259 if (m->is_static()) {
260 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT);
261 } else if (m->is_initializer()) {
262 flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
263 } else {
264 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
265 }
266 break;
267
268 default: assert(false, "bad CallInfo"); return NULL;
269 }
270
271 // @CallerSensitive annotation detected
272 if (m->caller_sensitive()) {
273 flags |= CALLER_SENSITIVE;
274 }
275
276 oop mname_oop = mname();
277 java_lang_invoke_MemberName::set_flags( mname_oop, flags);
278 java_lang_invoke_MemberName::set_vmtarget(mname_oop, m());
279 java_lang_invoke_MemberName::set_vmindex( mname_oop, vmindex); // vtable/itable index
280 java_lang_invoke_MemberName::set_clazz( mname_oop, m_klass->java_mirror());
281 // Note: name and type can be lazily computed by resolve_MemberName,
282 // if Java code needs them as resolved String and MethodType objects.
283 // The clazz must be eagerly stored, because it provides a GC
284 // root to help keep alive the Method*.
285 // If relevant, the vtable or itable value is stored as vmindex.
286 // This is done eagerly, since it is readily available without
287 // constructing any new objects.
288 // TO DO: maybe intern mname_oop
289 if (m->method_holder()->add_member_name(mname)) {
290 return mname();
291 } else {
292 // Redefinition caused this to fail. Return NULL (and an exception?)
293 return NULL;
294 }
295 }
296
297 oop MethodHandles::init_field_MemberName(Handle mname, fieldDescriptor& fd, bool is_setter) {
298 int flags = (jushort)( fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS );
299 flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT);
300 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT);
301 Metadata* vmtarget = fd.field_holder();
302 int vmindex = fd.offset(); // determines the field uniquely when combined with static bit
303 oop mname_oop = mname();
304 java_lang_invoke_MemberName::set_flags(mname_oop, flags);
305 java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget);
306 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
307 java_lang_invoke_MemberName::set_clazz(mname_oop, fd.field_holder()->java_mirror());
308 oop type = field_signature_type_or_null(fd.signature());
309 oop name = field_name_or_null(fd.name());
310 if (name != NULL)
311 java_lang_invoke_MemberName::set_name(mname_oop, name);
312 if (type != NULL)
313 java_lang_invoke_MemberName::set_type(mname_oop, type);
314 // Note: name and type can be lazily computed by resolve_MemberName,
315 // if Java code needs them as resolved String and Class objects.
316 // Note that the incoming type oop might be pre-resolved (non-null).
317 // The base clazz and field offset (vmindex) must be eagerly stored,
318 // because they unambiguously identify the field.
319 // Although the fieldDescriptor::_index would also identify the field,
320 // we do not use it, because it is harder to decode.
321 // TO DO: maybe intern mname_oop
322 return mname();
323 }
324
325 // JVM 2.9 Special Methods:
326 // A method is signature polymorphic if and only if all of the following conditions hold :
327 // * It is declared in the java.lang.invoke.MethodHandle class.
328 // * It has a single formal parameter of type Object[].
329 // * It has a return type of Object.
330 // * It has the ACC_VARARGS and ACC_NATIVE flags set.
331 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) {
332 if (klass == NULL)
333 return false;
334 // The following test will fail spuriously during bootstrap of MethodHandle itself:
335 // if (klass != SystemDictionary::MethodHandle_klass())
336 // Test the name instead:
337 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle())
338 return false;
339 Symbol* poly_sig = vmSymbols::object_array_object_signature();
340 Method* m = InstanceKlass::cast(klass)->find_method(name, poly_sig);
341 if (m == NULL) return false;
342 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
343 int flags = m->access_flags().as_int();
344 return (flags & required) == required;
345 }
346
347
348 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) {
349 assert(is_signature_polymorphic_intrinsic(iid), "%d %s", iid, vmIntrinsics::name_at(iid));
350 switch (iid) {
351 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name();
352 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name();
353 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name();
354 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name();
355 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name();
356 }
357 fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid));
358 return 0;
359 }
360
361 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) {
362 switch (iid) {
363 case vmIntrinsics::_invokeBasic: return 0;
364 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual;
365 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic;
366 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial;
367 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface;
368 }
369 fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid));
370 return 0;
371 }
372
373 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) {
374 vmSymbols::SID name_id = vmSymbols::find_sid(name);
375 switch (name_id) {
376 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins.
377 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric;
378 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic:
379 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic;
380
381 // There is one static signature-polymorphic method for each JVM invocation mode.
382 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual;
383 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic;
384 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial;
385 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface;
386 }
387
388 // Cover the case of invokeExact and any future variants of invokeFoo.
389 Klass* mh_klass = SystemDictionary::well_known_klass(
390 SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) );
391 if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name))
392 return vmIntrinsics::_invokeGeneric;
393
394 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against.
395 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic.
396 return vmIntrinsics::_none;
397 }
398
399 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) {
400 if (klass != NULL &&
401 klass->name() == vmSymbols::java_lang_invoke_MethodHandle()) {
402 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
403 if (iid != vmIntrinsics::_none)
404 return iid;
405 if (is_method_handle_invoke_name(klass, name))
406 return vmIntrinsics::_invokeGeneric;
407 }
408 return vmIntrinsics::_none;
409 }
410
411
412 // convert the external string or reflective type to an internal signature
413 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) {
414 if (java_lang_invoke_MethodType::is_instance(type_str)) {
415 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found, THREAD);
416 } else if (java_lang_Class::is_instance(type_str)) {
417 return java_lang_Class::as_signature(type_str, false, THREAD);
418 } else if (java_lang_String::is_instance_inlined(type_str)) {
419 if (intern_if_not_found) {
420 return java_lang_String::as_symbol(type_str, THREAD);
421 } else {
422 return java_lang_String::as_symbol_or_null(type_str);
423 }
424 } else {
425 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL);
426 }
427 }
428
429 static const char OBJ_SIG[] = "Ljava/lang/Object;";
430 enum { OBJ_SIG_LEN = 18 };
431
432 bool MethodHandles::is_basic_type_signature(Symbol* sig) {
433 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, "");
434 assert(vmSymbols::object_signature()->equals(OBJ_SIG), "");
435 const int len = sig->utf8_length();
436 for (int i = 0; i < len; i++) {
437 switch (sig->byte_at(i)) {
438 case 'L':
439 // only java/lang/Object is valid here
440 if (sig->index_of_at(i, OBJ_SIG, OBJ_SIG_LEN) != i)
441 return false;
442 i += OBJ_SIG_LEN-1; //-1 because of i++ in loop
443 continue;
444 case '(': case ')': case 'V':
445 case 'I': case 'J': case 'F': case 'D':
446 continue;
447 //case '[':
448 //case 'Z': case 'B': case 'C': case 'S':
449 default:
450 return false;
451 }
452 }
453 return true;
454 }
455
456 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) {
457 Symbol* bsig = NULL;
458 if (sig == NULL) {
459 return sig;
460 } else if (is_basic_type_signature(sig)) {
461 sig->increment_refcount();
462 return sig; // that was easy
463 } else if (sig->byte_at(0) != '(') {
464 BasicType bt = char2type(sig->byte_at(0));
465 if (is_subword_type(bt)) {
466 bsig = vmSymbols::int_signature();
467 } else {
468 assert(bt == T_OBJECT || bt == T_ARRAY, "is_basic_type_signature was false");
469 bsig = vmSymbols::object_signature();
470 }
471 } else {
472 ResourceMark rm;
473 stringStream buffer(128);
474 buffer.put('(');
475 int arg_pos = 0, keep_arg_pos = -1;
476 if (keep_last_arg)
477 keep_arg_pos = ArgumentCount(sig).size() - 1;
478 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) {
479 BasicType bt = ss.type();
480 size_t this_arg_pos = buffer.size();
481 if (ss.at_return_type()) {
482 buffer.put(')');
483 }
484 if (arg_pos == keep_arg_pos) {
485 buffer.write((char*) ss.raw_bytes(),
486 (int) ss.raw_length());
487 } else if (bt == T_OBJECT || bt == T_ARRAY) {
488 buffer.write(OBJ_SIG, OBJ_SIG_LEN);
489 } else {
490 if (is_subword_type(bt))
491 bt = T_INT;
492 buffer.put(type2char(bt));
493 }
494 arg_pos++;
495 }
496 const char* sigstr = buffer.base();
497 int siglen = (int) buffer.size();
498 bsig = SymbolTable::new_symbol(sigstr, siglen, THREAD);
499 }
500 assert(is_basic_type_signature(bsig) ||
501 // detune assert in case the injected argument is not a basic type:
502 keep_last_arg, "");
503 return bsig;
504 }
505
506 void MethodHandles::print_as_basic_type_signature_on(outputStream* st,
507 Symbol* sig,
508 bool keep_arrays,
509 bool keep_basic_names) {
510 st = st ? st : tty;
511 int len = sig->utf8_length();
512 int array = 0;
513 bool prev_type = false;
514 for (int i = 0; i < len; i++) {
515 char ch = sig->byte_at(i);
516 switch (ch) {
517 case '(': case ')':
518 prev_type = false;
519 st->put(ch);
520 continue;
521 case '[':
522 if (!keep_basic_names && keep_arrays)
523 st->put(ch);
524 array++;
525 continue;
526 case 'L':
527 {
528 if (prev_type) st->put(',');
529 int start = i+1, slash = start;
530 while (++i < len && (ch = sig->byte_at(i)) != ';') {
531 if (ch == '/' || ch == '.' || ch == '$') slash = i+1;
532 }
533 if (slash < i) start = slash;
534 if (!keep_basic_names) {
535 st->put('L');
536 } else {
537 for (int j = start; j < i; j++)
538 st->put(sig->byte_at(j));
539 prev_type = true;
540 }
541 break;
542 }
543 default:
544 {
545 if (array && char2type(ch) != T_ILLEGAL && !keep_arrays) {
546 ch = '[';
547 array = 0;
548 }
549 if (prev_type) st->put(',');
550 const char* n = NULL;
551 if (keep_basic_names)
552 n = type2name(char2type(ch));
553 if (n == NULL) {
554 // unknown letter, or we don't want to know its name
555 st->put(ch);
556 } else {
557 st->print("%s", n);
558 prev_type = true;
559 }
560 break;
561 }
562 }
563 // Switch break goes here to take care of array suffix:
564 if (prev_type) {
565 while (array > 0) {
566 st->print("[]");
567 --array;
568 }
569 }
570 array = 0;
571 }
572 }
573
574
575
576 static oop object_java_mirror() {
577 return SystemDictionary::Object_klass()->java_mirror();
578 }
579
580 oop MethodHandles::field_name_or_null(Symbol* s) {
581 if (s == NULL) return NULL;
582 return StringTable::lookup(s);
583 }
584
585 oop MethodHandles::field_signature_type_or_null(Symbol* s) {
586 if (s == NULL) return NULL;
587 BasicType bt = FieldType::basic_type(s);
588 if (is_java_primitive(bt)) {
589 assert(s->utf8_length() == 1, "");
590 return java_lang_Class::primitive_mirror(bt);
591 }
592 // Here are some more short cuts for common types.
593 // They are optional, since reference types can be resolved lazily.
594 if (bt == T_OBJECT) {
595 if (s == vmSymbols::object_signature()) {
596 return object_java_mirror();
597 } else if (s == vmSymbols::class_signature()) {
598 return SystemDictionary::Class_klass()->java_mirror();
599 } else if (s == vmSymbols::string_signature()) {
600 return SystemDictionary::String_klass()->java_mirror();
601 }
602 }
603 return NULL;
604 }
605
606
607 // An unresolved member name is a mere symbolic reference.
608 // Resolving it plants a vmtarget/vmindex in it,
609 // which refers directly to JVM internals.
610 Handle MethodHandles::resolve_MemberName(Handle mname, KlassHandle caller, TRAPS) {
611 Handle empty;
612 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
613
614 if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) {
615 // Already resolved.
616 DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname()));
617 assert(vmindex >= Method::nonvirtual_vtable_index, "");
618 return mname;
619 }
620
621 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname()));
622 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname()));
623 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname()));
624 int flags = java_lang_invoke_MemberName::flags(mname());
625 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
626 if (!ref_kind_is_valid(ref_kind)) {
627 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty);
628 }
629
630 DEBUG_ONLY(int old_vmindex);
631 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input");
632
633 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) {
634 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty);
635 }
636
637 instanceKlassHandle defc;
638 {
639 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop());
640 if (defc_klass == NULL) return empty; // a primitive; no resolution possible
641 if (!defc_klass->is_instance_klass()) {
642 if (!defc_klass->is_array_klass()) return empty;
643 defc_klass = SystemDictionary::Object_klass();
644 }
645 defc = instanceKlassHandle(THREAD, defc_klass);
646 }
647 if (defc.is_null()) {
648 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty);
649 }
650 defc->link_class(CHECK_(empty)); // possible safepoint
651
652 // convert the external string name to an internal symbol
653 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str());
654 if (name == NULL) return empty; // no such name
655 if (name == vmSymbols::class_initializer_name())
656 return empty; // illegal name
657
658 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none;
659 if ((flags & ALL_KINDS) == IS_METHOD &&
660 (defc() == SystemDictionary::MethodHandle_klass()) &&
661 (ref_kind == JVM_REF_invokeVirtual ||
662 ref_kind == JVM_REF_invokeSpecial ||
663 // static invocation mode is required for _linkToVirtual, etc.:
664 ref_kind == JVM_REF_invokeStatic)) {
665 vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
666 if (iid != vmIntrinsics::_none &&
667 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) {
668 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic.
669 // For a static reference it could an internal linkage routine like _linkToVirtual, etc.
670 mh_invoke_id = iid;
671 }
672 }
673
674 // convert the external string or reflective type to an internal signature
675 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty));
676 if (type == NULL) return empty; // no such signature exists in the VM
677
678 // Time to do the lookup.
679 switch (flags & ALL_KINDS) {
680 case IS_METHOD:
681 {
682 CallInfo result;
683 LinkInfo link_info(defc, name, type, caller, caller.not_null());
684 {
685 assert(!HAS_PENDING_EXCEPTION, "");
686 if (ref_kind == JVM_REF_invokeStatic) {
687 LinkResolver::resolve_static_call(result,
688 link_info, false, THREAD);
689 } else if (ref_kind == JVM_REF_invokeInterface) {
690 LinkResolver::resolve_interface_call(result, Handle(), defc,
691 link_info, false, THREAD);
692 } else if (mh_invoke_id != vmIntrinsics::_none) {
693 assert(!is_signature_polymorphic_static(mh_invoke_id), "");
694 LinkResolver::resolve_handle_call(result, link_info, THREAD);
695 } else if (ref_kind == JVM_REF_invokeSpecial) {
696 LinkResolver::resolve_special_call(result,
697 link_info, THREAD);
698 } else if (ref_kind == JVM_REF_invokeVirtual) {
699 LinkResolver::resolve_virtual_call(result, Handle(), defc,
700 link_info, false, THREAD);
701 } else {
702 assert(false, "ref_kind=%d", ref_kind);
703 }
704 if (HAS_PENDING_EXCEPTION) {
705 return empty;
706 }
707 }
708 if (result.resolved_appendix().not_null()) {
709 // The resolved MemberName must not be accompanied by an appendix argument,
710 // since there is no way to bind this value into the MemberName.
711 // Caller is responsible to prevent this from happening.
712 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty);
713 }
714 oop mname2 = init_method_MemberName(mname, result);
715 return Handle(THREAD, mname2);
716 }
717 case IS_CONSTRUCTOR:
718 {
719 CallInfo result;
720 LinkInfo link_info(defc, name, type, caller, caller.not_null());
721 {
722 assert(!HAS_PENDING_EXCEPTION, "");
723 if (name == vmSymbols::object_initializer_name()) {
724 LinkResolver::resolve_special_call(result, link_info, THREAD);
725 } else {
726 break; // will throw after end of switch
727 }
728 if (HAS_PENDING_EXCEPTION) {
729 return empty;
730 }
731 }
732 assert(result.is_statically_bound(), "");
733 oop mname2 = init_method_MemberName(mname, result);
734 return Handle(THREAD, mname2);
735 }
736 case IS_FIELD:
737 {
738 fieldDescriptor result; // find_field initializes fd if found
739 {
740 assert(!HAS_PENDING_EXCEPTION, "");
741 LinkInfo link_info(defc, name, type, caller, /*check_access*/false);
742 LinkResolver::resolve_field(result, link_info, Bytecodes::_nop, false, THREAD);
743 if (HAS_PENDING_EXCEPTION) {
744 return empty;
745 }
746 }
747 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind));
748 return Handle(THREAD, mname2);
749 }
750 default:
751 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
752 }
753
754 return empty;
755 }
756
757 // Conversely, a member name which is only initialized from JVM internals
758 // may have null defc, name, and type fields.
759 // Resolving it plants a vmtarget/vmindex in it,
760 // which refers directly to JVM internals.
761 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
762 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
763 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
764 int vmindex = java_lang_invoke_MemberName::vmindex(mname());
765 if (vmtarget == NULL) {
766 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
767 }
768
769 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL);
770 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL);
771 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL);
772 int flags = java_lang_invoke_MemberName::flags(mname());
773
774 if (suppress != 0) {
775 if (suppress & _suppress_defc) have_defc = true;
776 if (suppress & _suppress_name) have_name = true;
777 if (suppress & _suppress_type) have_type = true;
778 }
779
780 if (have_defc && have_name && have_type) return; // nothing needed
781
782 switch (flags & ALL_KINDS) {
783 case IS_METHOD:
784 case IS_CONSTRUCTOR:
785 {
786 assert(vmtarget->is_method(), "method or constructor vmtarget is Method*");
787 methodHandle m(THREAD, (Method*)vmtarget);
788 DEBUG_ONLY(vmtarget = NULL); // safety
789 if (m.is_null()) break;
790 if (!have_defc) {
791 InstanceKlass* defc = m->method_holder();
792 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
793 }
794 if (!have_name) {
795 //not java_lang_String::create_from_symbol; let's intern member names
796 Handle name = StringTable::intern(m->name(), CHECK);
797 java_lang_invoke_MemberName::set_name(mname(), name());
798 }
799 if (!have_type) {
800 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
801 java_lang_invoke_MemberName::set_type(mname(), type());
802 }
803 return;
804 }
805 case IS_FIELD:
806 {
807 assert(vmtarget->is_klass(), "field vmtarget is Klass*");
808 if (!((Klass*) vmtarget)->is_instance_klass()) break;
809 instanceKlassHandle defc(THREAD, (Klass*) vmtarget);
810 DEBUG_ONLY(vmtarget = NULL); // safety
811 bool is_static = ((flags & JVM_ACC_STATIC) != 0);
812 fieldDescriptor fd; // find_field initializes fd if found
813 if (!defc->find_field_from_offset(vmindex, is_static, &fd))
814 break; // cannot expand
815 if (!have_defc) {
816 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
817 }
818 if (!have_name) {
819 //not java_lang_String::create_from_symbol; let's intern member names
820 Handle name = StringTable::intern(fd.name(), CHECK);
821 java_lang_invoke_MemberName::set_name(mname(), name());
822 }
823 if (!have_type) {
824 // If it is a primitive field type, don't mess with short strings like "I".
825 Handle type = field_signature_type_or_null(fd.signature());
826 if (type.is_null()) {
827 java_lang_String::create_from_symbol(fd.signature(), CHECK);
828 }
829 java_lang_invoke_MemberName::set_type(mname(), type());
830 }
831 return;
832 }
833 }
834 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
835 }
836
837 int MethodHandles::find_MemberNames(KlassHandle k,
838 Symbol* name, Symbol* sig,
839 int mflags, KlassHandle caller,
840 int skip, objArrayHandle results) {
841 // %%% take caller into account!
842
843 Thread* thread = Thread::current();
844
845 if (k.is_null() || !k->is_instance_klass()) return -1;
846
847 int rfill = 0, rlimit = results->length(), rskip = skip;
848 // overflow measurement:
849 int overflow = 0, overflow_limit = MAX2(1000, rlimit);
850
851 int match_flags = mflags;
852 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0);
853 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0);
854 bool local_only = !(search_superc | search_intfc);
855 bool classes_only = false;
856
857 if (name != NULL) {
858 if (name->utf8_length() == 0) return 0; // a match is not possible
859 }
860 if (sig != NULL) {
861 if (sig->utf8_length() == 0) return 0; // a match is not possible
862 if (sig->byte_at(0) == '(')
863 match_flags &= ~(IS_FIELD | IS_TYPE);
864 else
865 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD);
866 }
867
868 if ((match_flags & IS_TYPE) != 0) {
869 // NYI, and Core Reflection works quite well for this query
870 }
871
872 if ((match_flags & IS_FIELD) != 0) {
873 for (FieldStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) {
874 if (name != NULL && st.name() != name)
875 continue;
876 if (sig != NULL && st.signature() != sig)
877 continue;
878 // passed the filters
879 if (rskip > 0) {
880 --rskip;
881 } else if (rfill < rlimit) {
882 Handle result(thread, results->obj_at(rfill++));
883 if (!java_lang_invoke_MemberName::is_instance(result()))
884 return -99; // caller bug!
885 oop saved = MethodHandles::init_field_MemberName(result, st.field_descriptor());
886 if (saved != result())
887 results->obj_at_put(rfill-1, saved); // show saved instance to user
888 } else if (++overflow >= overflow_limit) {
889 match_flags = 0; break; // got tired of looking at overflow
890 }
891 }
892 }
893
894 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) {
895 // watch out for these guys:
896 Symbol* init_name = vmSymbols::object_initializer_name();
897 Symbol* clinit_name = vmSymbols::class_initializer_name();
898 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit>
899 bool negate_name_test = false;
900 // fix name so that it captures the intention of IS_CONSTRUCTOR
901 if (!(match_flags & IS_METHOD)) {
902 // constructors only
903 if (name == NULL) {
904 name = init_name;
905 } else if (name != init_name) {
906 return 0; // no constructors of this method name
907 }
908 } else if (!(match_flags & IS_CONSTRUCTOR)) {
909 // methods only
910 if (name == NULL) {
911 name = init_name;
912 negate_name_test = true; // if we see the name, we *omit* the entry
913 } else if (name == init_name) {
914 return 0; // no methods of this constructor name
915 }
916 } else {
917 // caller will accept either sort; no need to adjust name
918 }
919 for (MethodStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) {
920 Method* m = st.method();
921 Symbol* m_name = m->name();
922 if (m_name == clinit_name)
923 continue;
924 if (name != NULL && ((m_name != name) ^ negate_name_test))
925 continue;
926 if (sig != NULL && m->signature() != sig)
927 continue;
928 // passed the filters
929 if (rskip > 0) {
930 --rskip;
931 } else if (rfill < rlimit) {
932 Handle result(thread, results->obj_at(rfill++));
933 if (!java_lang_invoke_MemberName::is_instance(result()))
934 return -99; // caller bug!
935 CallInfo info(m);
936 oop saved = MethodHandles::init_method_MemberName(result, info);
937 if (saved != result())
938 results->obj_at_put(rfill-1, saved); // show saved instance to user
939 } else if (++overflow >= overflow_limit) {
940 match_flags = 0; break; // got tired of looking at overflow
941 }
942 }
943 }
944
945 // return number of elements we at leasted wanted to initialize
946 return rfill + overflow;
947 }
948
949 // Is it safe to remove stale entries from a dependency list?
950 static bool safe_to_expunge() {
951 // Since parallel GC threads can concurrently iterate over a dependency
952 // list during safepoint, it is safe to remove entries only when
953 // CodeCache lock is held.
954 return CodeCache_lock->owned_by_self();
955 }
956
957 void MethodHandles::add_dependent_nmethod(oop call_site, nmethod* nm) {
958 assert_locked_or_safepoint(CodeCache_lock);
959
960 oop context = java_lang_invoke_CallSite::context(call_site);
961 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
962 // Try to purge stale entries on updates.
963 // Since GC doesn't clean dependency contexts rooted at CallSiteContext objects,
964 // in order to avoid memory leak, stale entries are purged whenever a dependency list
965 // is changed (both on addition and removal). Though memory reclamation is delayed,
966 // it avoids indefinite memory usage growth.
967 deps.add_dependent_nmethod(nm, /*expunge_stale_entries=*/safe_to_expunge());
968 }
969
970 void MethodHandles::remove_dependent_nmethod(oop call_site, nmethod* nm) {
971 assert_locked_or_safepoint(CodeCache_lock);
972
973 oop context = java_lang_invoke_CallSite::context(call_site);
974 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
975 deps.remove_dependent_nmethod(nm, /*expunge_stale_entries=*/safe_to_expunge());
976 }
977
978 void MethodHandles::flush_dependent_nmethods(Handle call_site, Handle target) {
979 assert_lock_strong(Compile_lock);
980
981 int marked = 0;
982 CallSiteDepChange changes(call_site(), target());
983 {
984 NoSafepointVerifier nsv;
985 MutexLockerEx mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag);
986
987 oop context = java_lang_invoke_CallSite::context(call_site());
988 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
989 marked = deps.mark_dependent_nmethods(changes);
990 }
991 if (marked > 0) {
992 // At least one nmethod has been marked for deoptimization.
993 VM_Deoptimize op;
994 VMThread::execute(&op);
995 }
996 }
997
998 //------------------------------------------------------------------------------
999 // MemberNameTable
1000 //
1001
1002 MemberNameTable::MemberNameTable(int methods_cnt)
1003 : GrowableArray<jweak>(methods_cnt, true) {
1004 assert_locked_or_safepoint(MemberNameTable_lock);
1005 }
1006
1007 MemberNameTable::~MemberNameTable() {
1008 assert_locked_or_safepoint(MemberNameTable_lock);
1009 int len = this->length();
1010
1011 for (int idx = 0; idx < len; idx++) {
1012 jweak ref = this->at(idx);
1013 JNIHandles::destroy_weak_global(ref);
1014 }
1015 }
1016
1017 void MemberNameTable::add_member_name(jweak mem_name_wref) {
1018 assert_locked_or_safepoint(MemberNameTable_lock);
1019 this->push(mem_name_wref);
1020 }
1021
1022 #if INCLUDE_JVMTI
1023 // It is called at safepoint only for RedefineClasses
1024 void MemberNameTable::adjust_method_entries(InstanceKlass* holder, bool * trace_name_printed) {
1025 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
1026 // For each redefined method
1027 for (int idx = 0; idx < length(); idx++) {
1028 oop mem_name = JNIHandles::resolve(this->at(idx));
1029 if (mem_name == NULL) {
1030 continue;
1031 }
1032 Method* old_method = (Method*)java_lang_invoke_MemberName::vmtarget(mem_name);
1033
1034 if (old_method == NULL || !old_method->is_old()) {
1035 continue; // skip uninteresting entries
1036 }
1037 if (old_method->is_deleted()) {
1038 // skip entries with deleted methods
1039 continue;
1040 }
1041 Method* new_method = holder->method_with_idnum(old_method->orig_method_idnum());
1042
1043 assert(new_method != NULL, "method_with_idnum() should not be NULL");
1044 assert(old_method != new_method, "sanity check");
1045
1046 java_lang_invoke_MemberName::set_vmtarget(mem_name, new_method);
1047
1048 if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) {
1049 if (!(*trace_name_printed)) {
1050 // RC_TRACE_MESG macro has an embedded ResourceMark
1051 RC_TRACE_MESG(("adjust: name=%s",
1052 old_method->method_holder()->external_name()));
1053 *trace_name_printed = true;
1054 }
1055 // RC_TRACE macro has an embedded ResourceMark
1056 RC_TRACE(0x00400000, ("MemberName method update: %s(%s)",
1057 new_method->name()->as_C_string(),
1058 new_method->signature()->as_C_string()));
1059 }
1060 }
1061 }
1062 #endif // INCLUDE_JVMTI
1063
1064 //
1065 // Here are the native methods in java.lang.invoke.MethodHandleNatives
1066 // They are the private interface between this JVM and the HotSpot-specific
1067 // Java code that implements JSR 292 method handles.
1068 //
1069 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way
1070 // that intrinsic (non-JNI) native methods are defined in HotSpot.
1071 //
1072
1073 #ifndef PRODUCT
1074 #define EACH_NAMED_CON(template, requirement) \
1075 template(java_lang_invoke_MemberName,MN_IS_METHOD) \
1076 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \
1077 template(java_lang_invoke_MemberName,MN_IS_FIELD) \
1078 template(java_lang_invoke_MemberName,MN_IS_TYPE) \
1079 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \
1080 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \
1081 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \
1082 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \
1083 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \
1084 /*end*/
1085
1086 #define IGNORE_REQ(req_expr) /* req_expr */
1087 #define ONE_PLUS(scope,value) 1+
1088 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0;
1089 #define VALUE_COMMA(scope,value) scope::value,
1090 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 };
1091 #define STRING_NULL(scope,value) #value "\0"
1092 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) };
1093
1094 static bool advertise_con_value(int which) {
1095 if (which < 0) return false;
1096 bool ok = true;
1097 int count = 0;
1098 #define INC_COUNT(scope,value) \
1099 ++count;
1100 #define CHECK_REQ(req_expr) \
1101 if (which < count) return ok; \
1102 ok = (req_expr);
1103 EACH_NAMED_CON(INC_COUNT, CHECK_REQ);
1104 #undef INC_COUNT
1105 #undef CHECK_REQ
1106 assert(count == con_value_count, "");
1107 if (which < count) return ok;
1108 return false;
1109 }
1110
1111 #undef ONE_PLUS
1112 #undef VALUE_COMMA
1113 #undef STRING_NULL
1114 #undef EACH_NAMED_CON
1115 #endif // PRODUCT
1116
1117 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) {
1118 #ifndef PRODUCT
1119 if (advertise_con_value(which)) {
1120 assert(which >= 0 && which < con_value_count, "");
1121 int con = con_values[which];
1122 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh));
1123 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) {
1124 const char* str = &con_names[0];
1125 for (int i = 0; i < which; i++)
1126 str += strlen(str) + 1; // skip name and null
1127 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint
1128 box->obj_at_put(0, name);
1129 }
1130 return con;
1131 }
1132 #endif
1133 return 0;
1134 }
1135 JVM_END
1136
1137 // void init(MemberName self, AccessibleObject ref)
1138 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) {
1139 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1140 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
1141 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1142 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
1143 MethodHandles::init_MemberName(mname, target);
1144 }
1145 JVM_END
1146
1147 // void expand(MemberName self)
1148 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1149 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
1150 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1151 MethodHandles::expand_MemberName(mname, 0, CHECK);
1152 }
1153 JVM_END
1154
1155 // void resolve(MemberName self, Class<?> caller)
1156 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) {
1157 if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); }
1158 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1159
1160 // The trusted Java code that calls this method should already have performed
1161 // access checks on behalf of the given caller. But, we can verify this.
1162 if (VerifyMethodHandles && caller_jh != NULL &&
1163 java_lang_invoke_MemberName::clazz(mname()) != NULL) {
1164 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname()));
1165 if (reference_klass != NULL && reference_klass->is_objArray_klass()) {
1166 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass();
1167 }
1168
1169 // Reflection::verify_class_access can only handle instance classes.
1170 if (reference_klass != NULL && reference_klass->is_instance_klass()) {
1171 // Emulate LinkResolver::check_klass_accessability.
1172 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
1173 if (!Reflection::verify_class_access(caller,
1174 reference_klass,
1175 true)) {
1176 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), reference_klass->external_name());
1177 }
1178 }
1179 }
1180
1181 KlassHandle caller(THREAD,
1182 caller_jh == NULL ? (Klass*) NULL :
1183 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh)));
1184 Handle resolved = MethodHandles::resolve_MemberName(mname, caller, CHECK_NULL);
1185
1186 if (resolved.is_null()) {
1187 int flags = java_lang_invoke_MemberName::flags(mname());
1188 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
1189 if (!MethodHandles::ref_kind_is_valid(ref_kind)) {
1190 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format");
1191 }
1192 if ((flags & ALL_KINDS) == IS_FIELD) {
1193 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "field resolution failed");
1194 } else if ((flags & ALL_KINDS) == IS_METHOD ||
1195 (flags & ALL_KINDS) == IS_CONSTRUCTOR) {
1196 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "method resolution failed");
1197 } else {
1198 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed");
1199 }
1200 }
1201
1202 return JNIHandles::make_local(THREAD, resolved());
1203 }
1204 JVM_END
1205
1206 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) {
1207 if (mname == NULL ||
1208 java_lang_invoke_MemberName::vmtarget(mname) == NULL) {
1209 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved");
1210 } else {
1211 int flags = java_lang_invoke_MemberName::flags(mname);
1212 if ((flags & IS_FIELD) != 0 &&
1213 (must_be_static
1214 ? (flags & JVM_ACC_STATIC) != 0
1215 : (flags & JVM_ACC_STATIC) == 0)) {
1216 int vmindex = java_lang_invoke_MemberName::vmindex(mname);
1217 return (jlong) vmindex;
1218 }
1219 }
1220 const char* msg = (must_be_static ? "static field required" : "non-static field required");
1221 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg);
1222 return 0;
1223 }
1224
1225 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1226 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD);
1227 }
1228 JVM_END
1229
1230 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1231 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD);
1232 }
1233 JVM_END
1234
1235 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1236 // use the other function to perform sanity checks:
1237 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL);
1238 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh));
1239 return JNIHandles::make_local(THREAD, clazz);
1240 }
1241 JVM_END
1242
1243 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1244 if (mname_jh == NULL) return NULL;
1245 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1246 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname());
1247 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
1248 objArrayHandle result = oopFactory::new_objArray(SystemDictionary::Object_klass(), 2, CHECK_NULL);
1249 jvalue vmindex_value; vmindex_value.j = (long)vmindex;
1250 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL);
1251 result->obj_at_put(0, x);
1252 x = NULL;
1253 if (vmtarget == NULL) {
1254 x = NULL;
1255 } else if (vmtarget->is_klass()) {
1256 x = ((Klass*) vmtarget)->java_mirror();
1257 } else if (vmtarget->is_method()) {
1258 x = mname();
1259 }
1260 result->obj_at_put(1, x);
1261 return JNIHandles::make_local(env, result());
1262 }
1263 JVM_END
1264
1265
1266
1267 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1268 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1269 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls,
1270 jclass clazz_jh, jstring name_jh, jstring sig_jh,
1271 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) {
1272 if (clazz_jh == NULL || results_jh == NULL) return -1;
1273 KlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh)));
1274
1275 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh));
1276 if (results.is_null() || !results->is_objArray()) return -1;
1277
1278 TempNewSymbol name = NULL;
1279 TempNewSymbol sig = NULL;
1280 if (name_jh != NULL) {
1281 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh));
1282 if (name == NULL) return 0; // a match is not possible
1283 }
1284 if (sig_jh != NULL) {
1285 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh));
1286 if (sig == NULL) return 0; // a match is not possible
1287 }
1288
1289 KlassHandle caller;
1290 if (caller_jh != NULL) {
1291 oop caller_oop = JNIHandles::resolve_non_null(caller_jh);
1292 if (!java_lang_Class::is_instance(caller_oop)) return -1;
1293 caller = KlassHandle(THREAD, java_lang_Class::as_Klass(caller_oop));
1294 }
1295
1296 if (name != NULL && sig != NULL && results.not_null()) {
1297 // try a direct resolve
1298 // %%% TO DO
1299 }
1300
1301 int res = MethodHandles::find_MemberNames(k, name, sig, mflags,
1302 caller, skip, results);
1303 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks
1304 return res;
1305 }
1306 JVM_END
1307
1308 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1309 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1310 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh));
1311 {
1312 // Walk all nmethods depending on this call site.
1313 MutexLocker mu(Compile_lock, thread);
1314 MethodHandles::flush_dependent_nmethods(call_site, target);
1315 java_lang_invoke_CallSite::set_target(call_site(), target());
1316 }
1317 }
1318 JVM_END
1319
1320 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
1321 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
1322 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh));
1323 {
1324 // Walk all nmethods depending on this call site.
1325 MutexLocker mu(Compile_lock, thread);
1326 MethodHandles::flush_dependent_nmethods(call_site, target);
1327 java_lang_invoke_CallSite::set_target_volatile(call_site(), target());
1328 }
1329 }
1330 JVM_END
1331
1332 // It is called by a Cleaner object which ensures that dropped CallSites properly
1333 // deallocate their dependency information.
1334 JVM_ENTRY(void, MHN_clearCallSiteContext(JNIEnv* env, jobject igcls, jobject context_jh)) {
1335 Handle context(THREAD, JNIHandles::resolve_non_null(context_jh));
1336 {
1337 // Walk all nmethods depending on this call site.
1338 MutexLocker mu1(Compile_lock, thread);
1339
1340 int marked = 0;
1341 {
1342 NoSafepointVerifier nsv;
1343 MutexLockerEx mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1344 assert(safe_to_expunge(), "removal is not safe");
1345 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context());
1346 marked = deps.remove_all_dependents();
1347 }
1348 if (marked > 0) {
1349 // At least one nmethod has been marked for deoptimization
1350 VM_Deoptimize op;
1351 VMThread::execute(&op);
1352 }
1353 }
1354 }
1355 JVM_END
1356
1357 /**
1358 * Throws a java/lang/UnsupportedOperationException unconditionally.
1359 * This is required by the specification of MethodHandle.invoke if
1360 * invoked directly.
1361 */
1362 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1363 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively");
1364 return NULL;
1365 }
1366 JVM_END
1367
1368 /**
1369 * Throws a java/lang/UnsupportedOperationException unconditionally.
1370 * This is required by the specification of MethodHandle.invokeExact if
1371 * invoked directly.
1372 */
1373 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
1374 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively");
1375 return NULL;
1376 }
1377 JVM_END
1378
1379 /// JVM_RegisterMethodHandleMethods
1380
1381 #undef CS // Solaris builds complain
1382
1383 #define LANG "Ljava/lang/"
1384 #define JLINV "Ljava/lang/invoke/"
1385
1386 #define OBJ LANG "Object;"
1387 #define CLS LANG "Class;"
1388 #define STRG LANG "String;"
1389 #define CS JLINV "CallSite;"
1390 #define MT JLINV "MethodType;"
1391 #define MH JLINV "MethodHandle;"
1392 #define MEM JLINV "MemberName;"
1393 #define CTX JLINV "MethodHandleNatives$CallSiteContext;"
1394
1395 #define CC (char*) /*cast a literal from (const char*)*/
1396 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1397
1398 // These are the native methods on java.lang.invoke.MethodHandleNatives.
1399 static JNINativeMethod MHN_methods[] = {
1400 {CC "init", CC "(" MEM "" OBJ ")V", FN_PTR(MHN_init_Mem)},
1401 {CC "expand", CC "(" MEM ")V", FN_PTR(MHN_expand_Mem)},
1402 {CC "resolve", CC "(" MEM "" CLS ")" MEM, FN_PTR(MHN_resolve_Mem)},
1403 // static native int getNamedCon(int which, Object[] name)
1404 {CC "getNamedCon", CC "(I[" OBJ ")I", FN_PTR(MHN_getNamedCon)},
1405 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1406 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1407 {CC "getMembers", CC "(" CLS "" STRG "" STRG "I" CLS "I[" MEM ")I", FN_PTR(MHN_getMembers)},
1408 {CC "objectFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_objectFieldOffset)},
1409 {CC "setCallSiteTargetNormal", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetNormal)},
1410 {CC "setCallSiteTargetVolatile", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetVolatile)},
1411 {CC "clearCallSiteContext", CC "(" CTX ")V", FN_PTR(MHN_clearCallSiteContext)},
1412 {CC "staticFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_staticFieldOffset)},
1413 {CC "staticFieldBase", CC "(" MEM ")" OBJ, FN_PTR(MHN_staticFieldBase)},
1414 {CC "getMemberVMInfo", CC "(" MEM ")" OBJ, FN_PTR(MHN_getMemberVMInfo)}
1415 };
1416
1417 static JNINativeMethod MH_methods[] = {
1418 // UnsupportedOperationException throwers
1419 {CC "invoke", CC "([" OBJ ")" OBJ, FN_PTR(MH_invoke_UOE)},
1420 {CC "invokeExact", CC "([" OBJ ")" OBJ, FN_PTR(MH_invokeExact_UOE)}
1421 };
1422
1423 /**
1424 * Helper method to register native methods.
1425 */
1426 static bool register_natives(JNIEnv* env, jclass clazz, const JNINativeMethod* methods, jint nMethods) {
1427 int status = env->RegisterNatives(clazz, methods, nMethods);
1428 if (status != JNI_OK || env->ExceptionOccurred()) {
1429 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support.");
1430 env->ExceptionClear();
1431 return false;
1432 }
1433 return true;
1434 }
1435
1436 /**
1437 * This one function is exported, used by NativeLookup.
1438 */
1439 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
1440 assert(!MethodHandles::enabled(), "must not be enabled");
1441 bool enable_MH = true;
1442
1443 jclass MH_class = NULL;
1444 if (SystemDictionary::MethodHandle_klass() == NULL) {
1445 enable_MH = false;
1446 } else {
1447 oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror();
1448 MH_class = (jclass) JNIHandles::make_local(env, mirror);
1449 }
1450
1451 if (enable_MH) {
1452 ThreadToNativeFromVM ttnfv(thread);
1453
1454 if (enable_MH) {
1455 enable_MH = register_natives(env, MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod));
1456 }
1457 if (enable_MH) {
1458 enable_MH = register_natives(env, MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod));
1459 }
1460 }
1461
1462 if (TraceInvokeDynamic) {
1463 tty->print_cr("MethodHandle support loaded (using LambdaForms)");
1464 }
1465
1466 if (enable_MH) {
1467 if (MethodHandles::generate_adapters() == false) {
1468 THROW_MSG(vmSymbols::java_lang_VirtualMachineError(), "Out of space in CodeCache for method handle adapters");
1469 }
1470 MethodHandles::set_enabled(true);
1471 }
1472 }
1473 JVM_END